Move back to squizlabs/php_codesniffer package and bump to 3.8.0

Now it's pointing to phpcsstandards/php_codesniffer repo
so we don't need to use the new package that will be
declared as abandoned in the future.

Also, bump to 3.8.0 just released.

And minor changes to composer.json

This reverts commit 1e6613d.

composer.json

@@ -18,13 +18,12 @@
             "email": "[email protected]"
         },
         {
-            "name": "Eloy Lafuente",
-            "email": "[email protected]"
+            "name": "Eloy Lafuente (stronk7)"
         }
     ],
     "require": {
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
-        "phpcsstandards/php_codesniffer": "^3.7.2",
+        "squizlabs/php_codesniffer": "^3.8.0",
         "phpcsstandards/phpcsextra": "^1.2.0",
         "phpcompatibility/php-compatibility": "dev-develop#306cd263"
     },